Inspección no destructiva en soldaduras de la aleación de aluminio AA7075-T6 obtenidas por friction stir welding
Year: 2019
Type: article
Abstract: Friction Stir Welding (FSW) is a solid-state welding process invented in 1991 by The Welding Institute (TWI), in which a rotating tool advances through a joint of material over a backing plate, generating continuity between parts. Among the main applications is the joining of low weldability materials, those in which is complex to achieve sound welds using conventional fusion welding methods such as the 2XXX and 7XXX aluminum alloys series. Weld joint soundness can be evaluated employing Destructive (DT) and conventional Nondestructive Tests (NDT), the last ones are an interesting choice that maintain the integrity of the welded joint, highlighting visual and dye penetrant testing for their easy application. The aim of this work is to evaluate the applicability of conventional NDS in the FSW process thinking about local and low cost inspection. In this work, welds of the aluminum alloy AA7075-T6 were obtained using a conventional milling machine FEXAC UG adapted for the process and a force-measuring device. For the identification and location of discontinuities diverse Non-Destructive Tests (NTD): ultrasound indications were obtained with an Olympus EPOCH 4 detector, radiography with a Dandong XXG-2005 radiation source and for the dye penetrant inspection Spotcheck® products were used in addition to visual inspection to corroborate the functionality of the latter and its correspondence with other results. Weld joints soundness was evaluated using the previously listed conventional NDT and acceptance criteria based on existing codes. Tunnel type discontinuities were observed in the radiographies, flaws detected with the dye penetrant associated to the lack of pin penetration and ultrasound indications above the established thresh old. It is concluded that conventional NDT can be used according to each test particular limitations, size and position of discontinuities and equipment characteristics.
Source: Vitae (Universidad de Antioquia)
Institution: Universidad EIA
Language: Spanish
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2969964433